Earlier quoted context omitted.
If “we could all” is constrained to households earning 6-figures, I tend to agree. I doubt a household making $30K/yr could realistically live on $10K/yr. (Further, if everyone FIRE’d, growth would slow to the point where you’d need to save more to generate the same income from investments. We’re so far from that being any kind of practical worry, that it can be safely ignored I think, but would be a concern if it be…
Isn't the FIRE person just delaying it's consumption? At some point the saved up money will be spent, therefore I wouldn't expect it to have a huge negative impact on economic growth
So consumption is reduced by 60% over the course of a lifetime, which by most metrics would shrink the economy by a similar amount - of course, most FIRE people also keep being productive after retiring, so it's probably not so straightforward to account for everything.